Definition: You are given a question on marketing. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: ACORN, a segmentation analysis technique, stands for which of the following?
(A)A corresponding official residential notation. (B)A classification of reported nationals. (C)A classification of residential neighbourhoods. (D)A countrywide official resources navigation.

C